61 
BLACK SPOT. 
This disease seems to be troublesome in many places, 
and Rose growers in the Northern States have suffered 
much from its ravages. It has of late made its appear- 
“ance in many places in the South, although at present it 
is not generally known. The Hybrid Perpetuals and the 
Hybrid Teas appear to suffer most from it. As its name 
implies, it isa black spot that comes upon the leaves of 
the Rose, and gives it a blighted appearance. As soon 
as the plant becomes infested with it, it loses all its vigor 
and will cease to make further growth. The real cause 
of Black Spot is at present a disputed question, some 
contending that it first affects the plants through the 
leaves; others again contend that it is first caused by a 
loss of root action; but as far as we have been able to 
investigate, there are no two cases exactly alike, so that 
it is very hard to determine what is the primary cause 
of trouble in both cases, and this disease is to-day less 
understood by the most practical men in the business 
than any other disease peculiar to the Rose. Since the 
causes from which it emanates is so badly understood, it 
is of course equally difficult to suggest a remedy. When 
grown in greenhouses, the best means of checking the 
disease we have found is a healthy, dry atmosphere at 
night and a free circulation of air during the day, with a 
little fire heat to counteract any cold draughts. Where 
Roses are infested with Black Spot in the open ground, 
the best remedy is to cut the plants back and remove all 
leaves infested; when it starts to grow again the chances 
are that the Black Spot will not appear. 
RED SPIDER. 
This is a most destructive little insect, and generally 
commits its ravages in a greenhouse or pit, and only 
